connect4-winner.js implemented

code/connect4-winner.js

@@ -0,0 +1,76 @@
+let testBoard = [
+    [ '_', '_', '_', '_', '_', '_', '_' ],
+    [ '_', '_', '_', '_', '_', '_', '_' ],
+    [ '_', '_', '_', 'r', 'r', 'r', '' ],
+    [ '_', '_', '_', 'r', 'r', 'b', 'b' ],
+    [ '_', '_', 'r', 'b', 'r', '', 'b' ],
+    [ 'b', 'r', 'b', 'r', 'r', 'b', 'r' ]
+]
+
+let checkLine = function (color, board, y, x, length){
+    if (length === 4){
+        return true;
+    } else if(y === board.length || x === board[1].length){
+        return false
+    }
+    else if(board[y][x+1] === color){
+        return checkLine(color, board,y, x+1, length + 1)
+    } else {
+        return false;
+    }
+}
+let checkDownRight = function (color,board, y, x, length){
+    if (length === 4){
+        return true;
+    } else if((y + 1) === board.length || (x + 1) === board[1].length){
+        return false
+    }
+    else if(board[y+1][x+1] === color){
+        return checkDownRight(color,board,y + 1, x + 1, length + 1)
+    } else {
+        return false;
+    }
+}
+let checkDownLeft = function (color,board, y, x, length){
+    if (length === 4){
+        return true;
+    } else if((y + 1) === board.length || (x - 1)< 0){
+        return false
+    }
+    else if(board[y+1][x-1] === color){
+        return checkDownLeft(color,board,y + 1, x - 1, length + 1)
+    } else {
+        return false;
+    }
+}
+
+let checkDown = function (color,board, y, x, length){
+    if (length === 4){
+        return true;
+    } else if((y + 1)=== board.length){
+        return false
+    }
+    else if(board[y + 1][x] === color){
+        return checkDown(color,board,y + 1, x, length + 1)
+    } else {
+        return false;
+    }
+}
+
+
+let connect4Winner = function (color, board) {
+    for(let y = 0; y < board.length; y++){
+        for(let x = 0; x < board[y].length; x++){
+            if(board[y][x] === color){
+                if (checkLine(color,board,y,x,1) || checkDown(color,board,y,x,1) || checkDownRight(color,board,y,x,1) || checkDownLeft(color,board,y,x,1)){
+                    console.log('win')
+                    return true;
+                }
+            }
+        }
+    }
+    return false;
+}
+
+
+console.log(connect4Winner('r', testBoard))